CN108884925A - The manufacturing method of worm gear - Google Patents

The manufacturing method of worm gear Download PDF

Info

Publication number
CN108884925A
CN108884925A CN201780021126.9A CN201780021126A CN108884925A CN 108884925 A CN108884925 A CN 108884925A CN 201780021126 A CN201780021126 A CN 201780021126A CN 108884925 A CN108884925 A CN 108884925A
Authority
CN
China
Prior art keywords
mold
tooth
gear teeth
flank
worm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201780021126.9A
Other languages
Chinese (zh)
Inventor
吉川真乐
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KYB Corp
Original Assignee
Kayaba Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kayaba Industry Co Ltd filed Critical Kayaba Industry Co Ltd
Publication of CN108884925A publication Critical patent/CN108884925A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D15/00—Producing gear wheels or similar articles with grooves or projections, e.g. control knobs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/42—Moulds or cores; Details thereof or accessories therefor characterised by the shape of the moulding surface, e.g. ribs or grooves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/28—Making machine elements wheels; discs
    • B21K1/30—Making machine elements wheels; discs with gear-teeth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1615—The materials being injected at different moulding stations
    • B29C45/162—The materials being injected at different moulding stations using means, e.g. mould parts, for transferring an injected part between moulding stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
    • F16H1/04—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members
    • F16H1/12—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes
    • F16H1/16—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes comprising worm and worm-wheel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/06—Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/08—Profiling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/08—Profiling
    • F16H55/0886—Profiling with corrections along the width, e.g. flank width crowning for better load distribution
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/22—Toothed members; Worms for transmissions with crossing shafts, especially worms, worm-gears
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2015/00—Gear wheels or similar articles with grooves or projections, e.g. control knobs
    • B29L2015/003—Gears
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/06—Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties
    • F16H2055/065—Moulded gears, e.g. inserts therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Gears, Cams (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Power Steering Mechanism (AREA)
  • Gear Transmission (AREA)

Abstract

The manufacturing method of worm gear (10) includes process below：1st mold (43) and the 2nd mold (53) are combined, form the die cavity (31) delimited using the 1st mold (43) and the 2nd mold (53), 1st mold (43) is used to form the 1st flank of tooth (13) of the gear teeth (12) pushed when worm shaft (20) is rotated to the direction (D1) by axis tooth (22), and the 2nd mold (53) is used to form the 2nd flank of tooth (14) of the gear teeth (12) pushed when worm shaft (20) is rotated to the direction (D2) by axis tooth (22)；Molten resin is injected to die cavity (31), is formed the gear teeth (12)；And the 1st mold (43) and the 2nd mold (53) are pulled open mutually along inclined direction tooth trace (T) relative to the gear teeth (12).

Description

The manufacturing method of worm gear
Technical field
The present invention relates to a kind of manufacturing methods of worm gear.
Background technique
It has been known that there is a kind of to be transmitted to the rotary force of electric motor by worm shaft and worm gear electric-powered turn of rack shaft To device.Worm gear has multiple teeth with the tooth engagement of worm shaft.Each tooth of worm gear has in worm screw axially scheduled direction rotation The 1st flank of tooth pushed when turning by the tooth of worm shaft and pushed when worm shaft rotates in the opposite direction by the tooth of worm shaft the 2 flank of tooth.
The part of the 1st flank of tooth and being partially formed as concave curved planar for the 2nd flank of tooth are disclosed in JP2013-160334A Worm gear.In particular, the region of the substantially half of the flank of tooth is formed as concave curved surface part, region in addition is formed as spiral face Point.Concave curved surface part is formed as from the center of tooth more towards end then further away from tooth trace, and helicoid part is formed parallel to tooth trace.
In addition, being disclosed in JP2013-160334A using the shaping mould that can be divided into the 1st mold and the 2nd mold The method for having to manufacture worm gear.1st mold has the 1st forming surface for forming the 1st flank of tooth, and the 2nd mold has for forming 2nd forming surface of the 2nd flank of tooth.1st mold and the 2nd mold are spaced apartly opposite and the 1st with the 1st forming surface and the 2nd forming surface That side opposite with the 2nd forming surface of same 2nd mold of 1st divisional plane of that side opposite with the 1st forming surface of mold The mode of 2nd segmentation face contact is combined with each other.The mould for forming the tooth of worm gear delimited using the 1st forming surface and the 2nd forming surface Chamber.By pulling open the 1st mold and the 2nd mold mutually along trace direction, by worm gear after molding from the 1st mold and the 2nd mould Tool removes.
Summary of the invention
When worm gear is engaged with worm shaft, contact face pressure is generated in the tooth of worm gear.By with corresponding with the tooth of worm shaft Shape form the curved face part of the 1st flank of tooth and the curved face part of the 2nd flank of tooth and increase worm shaft tooth and worm gear tooth it is mutual Contact area reduces the contact face pressure.In order to further decrease contact face pressure, it is expected that further increasing curved face part.
It is after molding being removed from the 1st mold and the 2nd mold but in the method disclosed in JP2013-160334A When worm gear, the 1st mold and the 2nd mold are pulled open mutually along trace direction.In order to by the 1st mold and the 2nd mold along tooth trace Direction is pulled open mutually, needs to be formed parallel to the 1st divisional plane and the 2nd divisional plane with trace direction.It is thus impossible to increase the 1st tooth The curved face part of the curved face part in face and the 2nd flank of tooth.
If increasing the curved face part of the 1st flank of tooth and the curved face part of the 2nd flank of tooth, then the 1st forming surface and the 2nd mould of the 1st mold 2nd forming surface of tool is not only formed as from the center of tooth more towards one end then further away from tooth trace, but also is formed as from the center of tooth More towards the other end then further away from tooth trace.Since the 1st divisional plane and the 2nd divisional plane are formed along tooth trace, in the 1st mold Centre portion is thicker compared with both ends, and the central portion of the 2nd mold is thicker compared with both ends.It is thus impossible to by the 1st mold and the 2nd Mold is extracted from worm gear after molding.
In this way, the curved face part and the 2nd flank of tooth of the 1st flank of tooth cannot be increased in method disclosed in JP2013-160334A Curved face part.
It is an object of the present invention to can be in the curved surface for the flank of tooth for forming worm gear with shape corresponding with the tooth of worm shaft Increase the curved face part while portion.
The present invention relates to the method for manufacture worm gear, which has multiple gear teeth with the axis tooth engagement of worm shaft.According to A certain technical solution of the invention, the manufacturing method of worm gear include process below：1st mold and the 2nd die assembly are got up, Form the die cavity delimited using the 1st mold and the 2nd mold, the 1st mold be used to form the gear teeth in the axial scheduled side of worm screw To the 1st flank of tooth that is pushed by axis tooth when rotation, the 2nd mold be used to form the gear teeth when worm shaft rotates in the opposite direction The 2nd flank of tooth pushed by axis tooth；Melted material is injected to die cavity, forms the gear teeth；And by the 1st mold and the 2nd mold along phase It pulls open mutually in direction inclined for the tooth trace of the gear teeth.
Detailed description of the invention
Fig. 1 is the side view of the worm gear manufactured using the manufacturing method of embodiments of the present invention, and expression is nibbled with worm shaft The state of conjunction.
Fig. 2 is the perspective view for indicating the part of worm gear of Fig. 1.
Fig. 3 is the local expansion figure of the pitch barrel surface of the worm gear of Fig. 2.
Fig. 4 is the figure for illustrating the manufacturing method of embodiments of the present invention, is indicated the 1st mold and the 2nd set of molds State altogether.
Fig. 5 is the figure for illustrating the manufacturing method of embodiments of the present invention, indicates to be filled with molten resin to die cavity State.
Fig. 6 is the figure for illustrating the manufacturing method of embodiments of the present invention, is indicated the 1st mold and the 2nd mold is mutual The state mutually pulled open.
Fig. 7 is the figure for illustrating the manufacturing method of comparative example.
Fig. 8 is the figure for the manufacturing method for illustrating the variation of embodiments of the present invention.
Specific embodiment
Hereinafter, being described with reference to the manufacturing method of the worm gear 10 of embodiments of the present invention.
As shown in Figure 1, worm gear 10 is applied to worm decelerating machine 100.In worm decelerating machine 100, worm gear 10 and worm shaft 20 engagements.The connection (not shown) of the rotary shaft of worm shaft 20 and motor, worm gear 10 and the connection (not shown) of such as pinion gear.From horse Rotary force up to output is passed to the rack shaft for making wheel steering by worm gear 10 and pinion gear, assists driver to vehicle The steering of wheel.
When worm shaft 20 is rotated with the rotation of the rotary shaft of motor, worm gear 10 rotates.At this point, the rotation of worm shaft 20 Turn to slow down and is passed to worm gear 10.Pinion gear is rotated with the rotation of worm gear 10.In this way, worm decelerating machine 100 is by snail The rotation of motor is slowed down and is transmitted to pinion gear by bar axis 20 and worm gear 10.
Worm shaft 20 has the axis tooth 22 of columned shaft body 21 and the periphery for being spirally formed on shaft body 21.Snail Wheel 10 has circular wheel body 11 and from the periphery of wheel body 11 multiple gear teeth 12 outstanding.The pitch and axis tooth of the gear teeth 12 22 pitch is roughly equal, and the gear teeth 12 are engaged with axis tooth 22.
Wheel body 11 and the gear teeth 12 are integrally formed by resin material.Metal sleeve is equipped in the inner circumferential of wheel body 11 17。
The gear teeth 12 are formed in the periphery of worm gear 10.In addition, the gear teeth 12 have the 1st flank of tooth 13 circumferentially intersected with worm gear 10 With the 2nd flank of tooth 14.2nd flank of tooth 14 is located at that side opposite with the 1st flank of tooth 13 of the gear teeth 12.
When worm shaft 20 is rotated to scheduled direction (direction D1 shown in FIG. 1), the 1st flank of tooth 13 of the gear teeth 12 is by axis tooth 22 push.As a result, worm gear 10 is rotated to the direction D3 shown in FIG. 1.In (the D2 shown in FIG. 1 in the opposite direction of worm shaft 20 Direction) rotation when, the 2nd flank of tooth 14 of the gear teeth 12 is pushed by axis tooth 22.As a result, worm gear 10 is rotated to the direction D4 shown in FIG. 1.
Fig. 2 is the perspective view for indicating the part of worm gear 10.Fig. 3 is the local expansion figure of the pitch barrel surface of worm gear 10.
As shown in Figures 2 and 3, the gear teeth 12 also have with the direction of the rotation axis R along worm gear 10 (hereinafter referred to as " rotation axis direction ") orthogonal the 1st end face 15 and the 2nd end face 16.2nd end face 16 be located at the gear teeth 12 with 15 phase of the 1st end face That anti-side.
As shown in figure 3, the 1st flank of tooth 13 has the rotation axis R along worm gear 10 and is formed as planar from the 1st end face 15 Planar portions 13a and be formed as curved curved face part 13b until from planar portions 13a to the 2nd end face 16.Curved face part 13b and snail The axis tooth 22 (referring to Fig.1) of bar axis 20 is correspondingly formed from planar portions 13a to the direction D4 deviously.
2nd flank of tooth 14 has planar portions 14a and curved face part 14b in the same manner as the 1st flank of tooth 13.Planar portions 14a is along worm gear 10 rotation axis R and be formed as planar from the 2nd end face 16.Curved face part 14b is with corresponding with the axis tooth 22 of worm shaft 20 It is shaped as curved.
Due to being formed with curved face part 13b in the 1st flank of tooth 13 and being formed with curved face part 14b, the gear teeth 12 in the 2nd flank of tooth 14 Trace direction relative to rotation axis direction tilt.
Here, " tooth trace " refers to the imaginary line at the center at the center and the 2nd end face 16 by the 1st end face 15, used in Fig. 3 The single dotted broken line for indicating appended drawing reference " T " indicates." trace direction " refers to the direction along tooth trace T.
Since the 1st flank of tooth 13 has curved face part 13b, with the whole the case where only being formed by planar portions 13a of the 1st flank of tooth 13 It compares, is capable of increasing the contact area of the 1st flank of tooth 13 and axis tooth 22 when worm shaft 20 is rotated to the direction D1.Similarly, due to 2nd flank of tooth 14 has curved face part 14b, therefore compared with the whole the case where only being formed by planar portions 14a of the 2nd flank of tooth 14, Neng Gouzeng The contact area of the 2nd flank of tooth 14 and axis tooth 22 when big worm shaft 20 is rotated to the direction D2.
By increasing the contact area of the 1st flank of tooth 13 and the 2nd flank of tooth 14 and axis tooth 22, can reduce in 13 He of the 1st flank of tooth The contact face pressure that 2nd flank of tooth 14 generates.Thus, it is possible to improve the durability of the gear teeth 12.
Then, the metal die 30 of the gear teeth 12 for forming worm gear 10 is illustrated referring to Fig. 4~Fig. 6.30 shape of metal die As the 1st metal die block 40 and the 2nd metal die block 50 can be divided into.
1st metal die block 40 has multiple 1st molds 43 of the 1st flank of tooth 13 (referring to Fig. 3) for forming the gear teeth 12. The main part 41 of 1st mold 43 from the 1st metal die block 40 is prominent.With the 1st flank of tooth 13 correspondingly in the molding of the 1st mold 43 Face 44 is formed with planar portions 44a and curved face part 44b.That is, planar portions 44a is formed as planar along rotation axis R, it is bent Facial 44b is formed deviously from planar portions 44a to the direction D4.
2nd metal die block 50 has multiple 2nd molds 53 of the 2nd flank of tooth 14 (referring to Fig. 3) for forming the gear teeth 12. The main part 51 of 2nd mold 53 from the 2nd metal die block 50 is prominent.With the 2nd flank of tooth 14 correspondingly in the molding of the 2nd mold 53 Face 54 is formed with planar portions 54a and curved face part 54b.
In the state that the 1st metal die block 40 and the 2nd metal die block 50 are combined, forming surface 44 and forming surface 54 is spaced apartly opposite.The top of 1st mold 43 is contacted with the side 52 of the main part 51 of the 2nd metal die block 50.2nd mould The top of tool 53 is contacted with the side 42 of the main part 41 of the 1st metal die block 40.
The die cavity 31 for forming the gear teeth 12 (referring to Fig. 3) delimited using forming surface 44,54 and side 42,52.Also It is to say, the side 42 of main part 41 is used to form the 1st end face 15 of the gear teeth 12, and the side 52 of main part 51 is for forming the gear teeth 12 The 2nd end face 16.
In addition, in the state that the 1st metal die block 40 and the 2nd metal die block 50 combine, the 1st mold 43 The face 55 of that side opposite with forming surface 54 in the face 45 and the 2nd mold 53 of that side opposite with forming surface 44 mutually connects Touching.That is, metal die 30 can be split with face 45 and face 55 for boundary.Hereinafter, " face 45 " is also referred to as " divisional plane 45 ", " face 55 " is also referred to as " divisional plane 55 ".
Then, illustrate the manufacturing method of worm gear 10, be more particularly the forming method of the gear teeth 12.
Firstly, forming die cavity 31 as shown in figure 4, the 1st metal die block 40 and the 2nd metal die block 50 are combined. Then, as shown in figure 5, injecting molten resin to die cavity 31, molten resin is cooling.Resin is with corresponding with the shape of die cavity 31 Shape solidification, form the gear teeth 12 being made of resin.
Then, as shown in fig. 6, it is the 1st metal die block 40 and the 2nd metal die block 50 is mutual along rotation axis direction It pulls open.As a result, removing worm gear 10 after molding from the 1st metal die block 40 and the 2nd metal die block 50.
In the present embodiment, since the 1st metal die block 40 and the 2nd metal die block 50 are by along rotation axis direction It pulls open mutually, therefore the divisional plane 45 of the 1st metal die block 40 and the divisional plane 55 of the 2nd metal die block 50 are along worm gear 10 Rotation axis R is formed.
The curved face part 44b of 1st mold 43 is as aforementioned from the planar portions 44a extended along rotation axis R to the direction D4 It is formed deviously.Since the divisional plane 45 of the 1st mold 43 is formed along rotation axis R, curved face part 44b is from planar portions 44a More then formed deviously closer to 45 ground of divisional plane towards the top of the 1st mold 43.Therefore, the 1st mold 43 is from cardinal extremity (the 1st mould The end in the direction for pulling open the 1st mold 43 of tool 43) more then formed thinner towards top.Thus, it is possible to by the 1st mold 43 It is extracted from worm gear 10 after molding.
Similarly, the curved face part 54b of the 2nd mold 53 is bent from the planar portions 54a extended along rotation axis R to the direction D3 Ground is formed.Since the divisional plane 55 of the 2nd mold 53 is formed along rotation axis R, curved face part 54b gets over court from planar portions 54a It is then formed deviously closer to 55 ground of divisional plane to the top of the 2nd mold 53.Therefore, the 2nd mold 53 is from cardinal extremity (the 2nd mold 53 The direction for pulling open the 2nd mold 53 end) more then formed thinner towards top.Thus, it is possible to by the 2nd mold 53 from Worm gear 10 after type is extracted.
Here, illustrating the manufacturing method of the worm gear of comparative example referring to Fig. 7.In a comparative example and, the 1st metal die block 140 include multiple 1st molds 143 with forming surface 144 and divisional plane 145, and the 2nd metal die block 150 includes having molding Multiple 2nd molds 153 in face 154 and divisional plane 155.Be formed with planar portions 144a and curved face part 144b in forming surface 144, at Type face 154 is formed with planar portions 154a and curved face part 154b.
In a comparative example, the 1st metal die block 140 and the 2nd metal die block 150 are by the trace direction along the gear teeth 112 It pulls open mutually.In this case, the divisional plane 145 of the 1st mold 143 is formed along tooth trace T.Therefore, the plane of the 1st mold 143 Portion 144a is formed along tooth trace T, and the curved face part 144b of the 1st mold 143 is formed deviously from planar portions 144a to the direction D4.
If foring planar portions along rotation axis R in a comparative example, as shown in the double dot dash line in Fig. 7 In the case where 144a, planar portions 144a more then extends further away from 145 ground of divisional plane towards curved face part 144b from cardinal extremity.In addition, In the case where curved face part 144b is formd deviously from planar portions 144a, direction is got over from planar portions 144a in the part of curved face part 144b The center of 1st mold 143 is then bent further away from 145 ground of divisional plane.Therefore, the 1st mold 143 is got over towards center from cardinal extremity and is then formed It obtains thicker.Thus, the 1st mold 143 cannot be extracted from worm gear after molding.
In this way, in a comparative example, due to forming planar portions 144a along tooth trace T, being bent landform from planar portions 144a At curved face part 144b.That is, in a comparative example, planar portions 144a cannot be formed as tilting relative to tooth trace T, in addition, Curved face part 144b cannot be formed as to getting over the center towards the 1st mold 143 then closer to tooth trace T from planar portions 144a.
Due to the gear teeth 112 the 1st flank of tooth 113 with shape corresponding with the shape of forming surface 144 of the 1st mold 143 at Type, therefore the planar portions 113a of the gear teeth 112 cannot be formed as tilting relative to tooth trace T.In addition, cannot be by the song of the gear teeth 112 Facial 113b, which is formed as being got over from planar portions 113a towards the center of the gear teeth 112, to be then bent closer to tooth trace T.Thus, Bu Neng Increasing while forming the curved face part 113b of the gear teeth 112 with shape corresponding with axis tooth 22 (referring to Fig.1) of worm shaft 20 should Curved face part 113b.
Similarly, in a comparative example, need to be formed the divisional plane 155 of the 2nd mold 153 along tooth trace T.It is thus impossible to will The planar portions 114a of the gear teeth 112 is formed as tilting relative to tooth trace T, cannot be formed as curved face part 114b to get over from planar portions 114a It is then bent towards the center of the gear teeth 112 closer to tooth trace T.Thus, it cannot be with the axis tooth 22 (referring to Fig.1) with worm shaft 20 Corresponding shape increases the curved face part 114b while forming the curved face part 114b of the gear teeth 112.
In the present embodiment, as shown in fig. 6, due to the 1st metal die block 40 by from the 2nd metal die block 50 along rotation Shaft axis direction is pulled open, therefore the divisional plane 45 of the 1st mold 43 is formed along rotation axis R.Therefore, along rotation axis R shape At the 1st mold 43 planar portions 44a along divisional plane 145 extend.In addition, the curved face part formed deviously from planar portions 44a 44b gets over towards the top of the 1st mold 43 from planar portions 44a and is then bent closer to 45 ground of divisional plane.Therefore, the 1st mold 43 is from base End more then forms thinner towards top.Thus, it is possible to which the 1st mold 43 is extracted from worm gear 10 after molding.
In this way, in the present embodiment, planar portions 44a can be formed along rotation axis R, it can be curved from planar portions 44a Curved face part 44b is formed bently.I.e. it is capable to planar portions 44a is formed as tilting relative to tooth trace T, furthermore it is possible to by bent Facial 44b is formed as getting over the center towards the 1st mold 43 from planar portions 44a then closer to tooth trace T.
Since the 1st flank of tooth 13 of the gear teeth 12 is formed with shape corresponding with the shape of forming surface 44 of the 1st mold 43, because This can be formed as the planar portions 13a of the gear teeth 12 to tilt relative to tooth trace T.Furthermore it is possible to by the curved face part 13b shape of the gear teeth 12 It is then bent closer to tooth trace T as getting over from planar portions 13a towards the center of the gear teeth 12.Thus, it is possible to with worm shaft 20 The corresponding shape of axis tooth 22 (referring to Fig.1) increase the curved face part 13b while form the curved face part 13b of the gear teeth 12.
Similarly, the divisional plane 55 of the 2nd mold 53 is formed along rotation axis R.It therefore, can be by the planar portions of the gear teeth 12 14a is formed as tilting relative to tooth trace T, can be formed as curved face part 14b to be got over from planar portions 14a towards the center of the gear teeth 12 then It is bent closer to tooth trace T.Thus, it is possible to be taken turns being formed with shape corresponding with axis tooth 22 (referring to Fig.1) of worm shaft 20 Increase the curved face part 14b while curved face part 14b of tooth 12.
In addition, in the present embodiment, since the 1st mold 43 is pulled open from the 2nd mold 53 along rotation axis direction, The divisional plane 45 of 1st mold 43 is formed along rotation axis R.Therefore, forming surface 44 can be formed to centre more towards base Until holding the tangent line for being then flexed up to forming surface 44 further away from tooth trace T parallel with rotation axis R.Similarly, it can will form Face 54, which is formed from, entreats the tangent line for being more then flexed up to forming surface 54 further away from tooth trace T towards cardinal extremity and rotation axis R flat Behavior stops.Thus, it is possible to further while forming curved face part 13b, 14b of the gear teeth 12 with shape corresponding with axis tooth 22 Increase curved face part 13b, 14b.
In the present embodiment, planar portions 13a and curved face part 13b are formed with but it is also possible to be the 1st tooth in the 1st flank of tooth 13 Face 13 is integrally formed into curved.It is equally possible that being that the 2nd flank of tooth 14 is integrally formed into curved.That is, can also be with It is, the 1st flank of tooth 13 is integrally formed into curved using the 1st mold 43 and the 2nd flank of tooth 14 is integrally formed using the 2nd mold 53 For curved.
Due to using the 1st mold 43 that the 1st flank of tooth 13 is integrally formed into curved and using the 2nd mold 53 by the 2nd flank of tooth 14 are integrally formed into curved, therefore when the 1st flank of tooth 13 and the 2nd flank of tooth 14 are integrally formed into curved, it is not necessary to utilization The gear teeth 12 that mold is molded with type apply processing.Thus, it is possible to increase the curved face part 13b of the 1st flank of tooth 13 with less working hour With the curved face part 14b of the 2nd flank of tooth 14.
1st metal die block 40 and the 2nd metal die block 50 are not limited to the mode pulled open along rotation axis direction, As long as by being pulled open along the inclined direction tooth trace T relative to the gear teeth 12.In this case and, the 1st metal die block 40 divisional plane 45 and the divisional plane 55 of the 2nd metal die block 50 are formed obliquely relative to tooth trace T.It therefore, can be by the 1st mould The forming surface 44 of tool 43 and the forming surface 54 of the 2nd mold 53 are formed from centre and are more then bent towards cardinal extremity further away from tooth trace T. Thus, it is possible to increase the curved face part while forming curved face part 13b, 14b of the gear teeth 12 with shape corresponding with axis tooth 22 13b、14b。
Preferably, the direction the 1st metal die block 40 and the 2nd metal die block 50 pulled open is relative to tooth trace T to rotation Shaft axis R rolls oblique.In this case, divisional plane 45,55 is formed obliquely relative to tooth trace T to the side rotation axis R.Therefore, It is separate until near cardinal extremity that the forming surface 54 of the forming surface 44 of 1st mold 43 and the 2nd mold 53 can be formed to centre Tooth trace T it is bent.Thus, it is possible to increase the song while forming curved face part 13b, 14b with shape corresponding with axis tooth 22 Facial 13b, 14b.
Fig. 8 is the figure for illustrating the manufacturing method of modified embodiment of the present embodiment, indicates to manufacture using the manufacturing method The gear teeth 212 and the metal die 230 that uses in this manufacturing method.Utilize the 1st metal die block 240 and the 2nd metal die Block 250 delimit the die cavity 231 for forming the gear teeth 212 (referring to Fig. 3).
The divisional plane 245 of 1st metal die block 240 from tooth trace T to the side rotation axis R and with crossing rotation axis R tilts. Similarly, the divisional plane 255 of the 2nd metal die block 250 from tooth trace T to the side rotation axis R and with crossing rotation axis R tilts. In metal die 230, after the molding of the gear teeth 212, the 1st metal die block 240 and the 2nd metal die block 250 are along divisional plane 245,255 pulled open mutually, that is to say, that the 1st metal die block 240 and the 2nd metal die block 250 by along from tooth trace T to The side rotation axis R and inclined direction is pulled open mutually with crossing rotation axis R.
In the manufacturing method of variation, forming surface 244,254 can be formed as curved until the 1st mold 243 Until the forming surface 254 of the cardinal extremity of the forming surface 244 and the 2nd mold 253 of cardinal extremity is parallel with divisional plane 245,255.Thus, it is possible to Expand the gear teeth 212 the 1st flank of tooth 213 curved face part 213b and the 2nd flank of tooth 214 curved face part 214b, be capable of increasing the gear teeth 212 with The contact area of axis tooth 22 (referring to Fig.1).
Hereinafter, concluding composition, the functions and effects for illustrating embodiments of the present invention.
Present embodiment is related to the system for having the worm gear 10 of the multiple gear teeth 12,212 engaged with the axis tooth 22 of worm shaft 20 Make method.The manufacturing method of worm gear 10 includes process below：1st mold 43,243 and the 2nd mold 53,253 are combined, The die cavity 31,231 delimited using the 1st mold 43,243 and the 2nd mold 53,253 is formed, the 1st mold 43,243 is for forming The 13,213, the 2nd mold 53 of the 1st flank of tooth of the gear teeth 12,212 pushed when worm shaft 20 is rotated to the direction D1 by axis tooth 22, 253 for forming the 2nd flank of tooth 14,214 of the gear teeth 12,212 pushed when worm shaft 20 is rotated to the direction D2 by axis tooth 22；To Die cavity 31,231 injects molten resin, forms the gear teeth 12,212；And by the 1st mold 43,243 and the 2nd mold 53,253 along It pulls open mutually in the inclined direction tooth trace T relative to the gear teeth 12,212.
In this configuration, since the 1st mold 43,243 and the 2nd mold 53,253 are by along relative to the inclined side of tooth trace T To pulling open mutually, therefore the divisional plane 45,245,55,255 of the 1st mold 43,243 and the 2nd mold 53,253 inclines relative to tooth trace T Tiltedly formed.Therefore, the forming surface 44,244,54,254 of the 1st mold 43,243 and the 2nd mold 53,253 can be formed as from Center is more then bent further away from tooth trace T towards cardinal extremity.Thus, it is possible to forming the gear teeth with shape corresponding with axis tooth 22 12, increase the curved face part 13b, 213b, 14b, 214b while 212 curved face part 13b, 213b, 14b, 214b.
In addition, in the manufacturing method of worm gear 10, by the 1st mold 43,243 and the 2nd mold 53,253 along relative to wheel The tooth trace T of tooth 12,212 is pulled open mutually to the inclined direction in the side rotation axis R.
In this configuration, since the 1st mold 43,243 and the 2nd mold 53,253 are by along the tooth relative to the gear teeth 12,212 Line T is pulled open mutually to the inclined direction in the side rotation axis R, therefore the divisional plane of the 1st mold 43,243 and the 2nd mold 53,253 45, it 245,55,255 is formed obliquely relative to tooth trace T to the side rotation axis R.Therefore, can by the 1st mold 43,243 at The forming surface 54,254 of type face 44,244 and the 2nd mold 53,253 be formed from centre towards until near cardinal extremity far from tooth trace T Ground bending.Thus, it is possible to shape corresponding with axis tooth 22 formed curved face part 13b, 213b of the gear teeth 12,212,14b, Increase the curved face part 13b, 213b, 14b, 214b while 214b.
In addition, in the manufacturing method of worm gear 10, by the 1st mold 43 and the 2nd mold 53 along the rotation axis R of worm gear 10 It pulls open mutually in direction.
In this configuration, since the 1st mold 43 and the 2nd mold 53 are pulled open mutually along rotation axis direction, the 1st Mold 43 and the divisional plane 45,55 of the 2nd mold 53 are formed along rotation axis R.Therefore, forming surface 44,54 can be formed as More then be flexed up to from center further away from tooth trace T towards cardinal extremity forming surface 44,54 tangent line it is parallel with rotation axis R until. Thus, it is possible to increase the curved face part while forming curved face part 13b, 14b of the gear teeth 12 with shape corresponding with axis tooth 22 13b、14b。
In addition, the 1st flank of tooth 13,213 is integrally formed into using the 1st mold 43,243 in the manufacturing method of worm gear 10 Curved, and the 2nd flank of tooth 14,214 is integrally formed into curved using the 2nd mold 53,253.
In this configuration, due to using the 1st mold 43,243 that the 1st flank of tooth 13,213 is integrally formed into curved and using 2nd flank of tooth 14,214 is integrally formed into curved by the 2nd mold 53,253, therefore by the 1st flank of tooth 13,213 and the 2nd flank of tooth 14, processing need not be applied to the gear teeth 12,212 for being molded with type using mold when 214 are integrally formed into curved.Thus, energy Enough curved face part 13b, 213b, 14b, 214b for increasing the gear teeth 12,212 with less working hour.
It this concludes the description of embodiments of the present invention, but above embodiment shows only application examples of the invention A part, purport simultaneously do not lie in the specific structure that protection scope of the present invention is defined in above embodiment.
For example, in the above-described embodiment, the gear teeth 12,212 are formed by resin.It can also be formed by the material that can be melted The gear teeth 12,212 substitute resin.
The Japanese Patent Application 2016- that this application claims filed an application based on March 28th, 2016 to Japanese Patent Office 63851 priority is incorporated into this specification by referring to by all the contents of the application.

Claims (4)

1. a kind of manufacturing method of worm gear, which has multiple gear teeth with the axis tooth engagement of worm shaft, wherein
The manufacturing method of the worm gear includes process below：
1st mold and the 2nd die assembly are got up, the die cavity delimited using the 1st mold and the 2nd mold is formed, it should 1st mold is used to form the 1st tooth of the gear teeth pushed when axially scheduled direction rotates the worm screw by the axis tooth Face, the 2nd mold be used for form the gear teeth when the worm shaft rotates in the opposite direction by the axis tooth push 2nd flank of tooth；
Melted material is injected to the die cavity, forms the gear teeth；And
1st mold and the 2nd mold are pulled open mutually along the inclined direction of tooth trace relative to the gear teeth.
2. the manufacturing method of worm gear according to claim 1, wherein
By the 1st mold and the 2nd mold along the tooth trace relative to the gear teeth to the rotary shaft line side of the worm gear It pulls open mutually in inclined direction.
3. the manufacturing method of worm gear according to claim 1, wherein
It pulls open mutually in the direction of rotation axis by the 1st mold and the 2nd mold along the worm gear.
4. the manufacturing method of worm gear according to claim 1, wherein
The 1st flank of tooth is integrally formed into curved using the 1st mold, and uses the 2nd mold by the described 2nd The flank of tooth is integrally formed into curved.
CN201780021126.9A 2016-03-28 2017-02-16 The manufacturing method of worm gear Pending CN108884925A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2016063851A JP6180574B1 (en) 2016-03-28 2016-03-28 Worm wheel manufacturing method
JP2016-063851 2016-03-28
PCT/JP2017/005739 WO2017169250A1 (en) 2016-03-28 2017-02-16 Method for producing worm wheel

Publications (1)

Publication Number Publication Date
CN108884925A true CN108884925A (en) 2018-11-23

Family

ID=59604866

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201780021126.9A Pending CN108884925A (en) 2016-03-28 2017-02-16 The manufacturing method of worm gear

Country Status (5)

Country Link
US (1) US20210178712A1 (en)
JP (1) JP6180574B1 (en)
CN (1) CN108884925A (en)
DE (1) DE112017001589T5 (en)
WO (1) WO2017169250A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH066226B2 (en) * 1988-08-31 1994-01-26 本田技研工業株式会社 Impeller casting method and casting apparatus
JP2007245521A (en) * 2006-03-15 2007-09-27 Shangyin Sci & Technol Co Ltd Method for producing ball-connected chain
JP5282931B2 (en) * 2007-12-04 2013-09-04 アイシン精機株式会社 Mold manufacturing method for worm wheel gear molding and mold for worm wheel gear molding
JP5857770B2 (en) * 2012-02-07 2016-02-10 株式会社ジェイテクト Worm wheel manufacturing method and worm wheel manufacturing apparatus
JP5719963B1 (en) 2014-09-08 2015-05-20 株式会社美創 Jewelery manufacturing method, Jewelery mold and jewelery

Also Published As

Publication number Publication date
DE112017001589T5 (en) 2018-12-13
WO2017169250A1 (en) 2017-10-05
JP2017180512A (en) 2017-10-05
US20210178712A1 (en) 2021-06-17
JP6180574B1 (en) 2017-08-16

Similar Documents

Publication Publication Date Title
US8360196B2 (en) Worm wheel, power steering apparatus including the worm wheel, and method of forming the worm wheel
JP5224375B2 (en) Worm wheel, method for producing injection mold for worm wheel, and method for producing worm wheel
JP5860899B2 (en) Worm gear mechanism
JP2001315160A (en) Method for manufacturing gear made of resin
JP2017082858A (en) Gear, method of manufacturing gear, and steering device
JP5141329B2 (en) Worm gear
JP6610413B2 (en) Manufacturing method of insert molded product
CN108884925A (en) The manufacturing method of worm gear
JP4423815B2 (en) Manufacturing method of resin worm wheel, body for resin worm wheel
JP5004050B2 (en) Worm and worm manufacturing mold
JP5857770B2 (en) Worm wheel manufacturing method and worm wheel manufacturing apparatus
JP2006336814A (en) Worm wheel structure and power steering device using worm wheel
JPH06147295A (en) Molding pinion, forming die therefor, and manufacture thereof
JP6271870B2 (en) Manufacturing method of resin roller shaft, molding die and roller shaft
JP2004223813A (en) Mold for manufacturing worm wheel
JP2003048236A (en) Method for manufacturing mold for injection-molding worm wheel
JP3014686B2 (en) Worm wheel injection molding apparatus, worm wheel injection molding method, and worm wheel
JP2903056B2 (en) Spiral knife
JP2008055649A (en) Worm wheel molding mold and molding method
JP2023121072A (en) Outer rotor for internal gear pump, manufacturing method of the same, and forming mold of the same
KR100879027B1 (en) Mold for pulse ring of abs
JP5282931B2 (en) Mold manufacturing method for worm wheel gear molding and mold for worm wheel gear molding
JP2003334724A (en) Manufacturing method of worm wheel
JP6966264B2 (en) Geared motor
JP2002206513A (en) Geared screw, and method of manufacturing the same

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
WD01 Invention patent application deemed withdrawn after publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20181123